Sure, it's a way to go as fast as you'd ever want. (The world record is over 55 mph.)
But it's not that simple. Windsurfing challenges mind and body together. No matter how accomplished you are the next maneuver you've never done is the hardest, and uncommon amounts of effort and frustration are always part of getting there. When you succeed, it's immensely gratifying.
Windsurfing embeds you in wind, waves, and sun, shifting with the seasons, the hour, the instant. You engage intimately with your environment; every twitch matters. When everything comes together you become one with nature.
See you on the water!
While you may find some valuable advice here, nothing beats eagerness and lots of practice, as well as watching and learning from more experienced windsurfers.